Back to results
US 5,089,735 AGranted
Direct-current motor
AssigneeSawafuji Electric Co., Ltd.
InventorsHideo Sawaguchi, Takeshi Muraoka, Kazuhiro Takahashi
Life of this patent
Estimating the term…
Abstract
A direct-current motor that facilitates the assembly and mounting of components of the motor, including a front bracket made of synthetic resin and defining recesses. A plurality of metallic brushholders are located in the recesses. The protection of the motor is improved by the waterproofing construction of the motor, including motor cords, and has a sturdy construction.
Claims6
A direct-current motor, including a motor case provided with a substantially bell shape;
- a front bracket connected to an opening of said motor case, said front bracket being formed of a synthetic resin and defining recesses;
- brushes held by said front bracket, metallic brush holders being inserted into said recesses, said metallic brush holders having open tops, said brush holders holding said brushes and each of said open tops being covered with an insulating plate;
- a commutator and a rotor, said commutator being disposed on a side of said rotor and means for urging said brushes for making sliding contact with said commutator for alternatively changing over electric current;
- and a waterproof construction including a waterproofing bracket having a hole with a tapered inside surface formed on an interior side of said hole, a grommet having a hole through which a cord is passed, said grommet having a tapered outer surface engaging said tapered inside surface of said hole, said grommet being compressed into said hole for said grommet pressing said cord to ensure air tightness;
- a collar having a hole through which said cord is passed and a key groove formed on an outer surface of said hole of said collar adjacent said tapered inside surface and a holder inserted into said key groove for maintaining said grommet positioned in said bracket hole.
2 more elements
Dependencies are inferred from the claim text.